Leonardo DiCaprio's Titantic appetite for top models has earned him a reputation as the world's most voracious model-dater. A fact which, rather than scaring them off, only seems to pique the interest of any hot young thing who should cross his path.

Pictures have today emerged with DiCaprio out and about in Sydney with his latest sweetheart, 22-year-old American lingerie model Erin Heatherton, who DiCaprio met at the recent Victoria's Secret show in New York.

What's remarkable about this is not that a handsome Hollywood star should be dating a beautiful young model, rather the outstanding dedication to model-chasing DiCaprio consistently displays.

With long-term relationships with Brazilian 'super' Gisele Bündchen and Israeli lingerie queen Bar Refaeli already under his belt, DiCaprio has seemingly upped the ante in 2011, being linked to a rapid-fire succession of beauties in the seven months since he and Refaeli split.

First came
Gossip Girl
actress turned Chanel 'face', Blake Lively, who was 'papped' cavorting with Leonardo on a yacht at the Cannes Film Festival while recently dispatched Refaeli watched from the shoreline. Their 'relationship' came to an end in October, freeing DiCaprio to get down to serious modelising business.

Next up was sultry Romanian lingerie model
Madalina Ghenea,
spotted slipping out of Leonardo's waterside mansion in Sydney, where the Hollywood actor is filming Baz Luhrmann's adaptation of
The Great Gatsby
.

But never one to get tied down when there are so many hot models in close proximity, DiCaprio's next move was a masterstroke. To mark his 37th birthday, the bounder threw a lavish party Down Under where no less than
40
models were reported to have been in attendance.

With his head, no doubt, still hurting from that hangover, DiCaprio was back in New York to chance his arm at the Victoria's Secret show where, according to insiders at the after-party, he took a shine to 19-year-old Karlie Kloss, who Vogue Italia recently dubbed 'The Body'.

Then, it was back to Sydney where news broke that DiCaprio had been out on the town with not one, but two Australian models - Alyce Crawford and Kendal Schuler - before Heatherton flew in from New York to put a stop to his shenanigans.

Whether this dalliance sees in 2012 remains to be seen, but one thing's for certain, DiCaprio must have been taking tips from his friend and
The Departed
co-star Jack Nicholson - perhaps the most prolific model dater of all time.